Equivalent & Substitute Parts for 70F157AP-RC

Part Overview

The 70F157AP-RC is a 9.4 nH unshielded wirewound inductor manufactured by Bourns Inc., rated for 2.828 A continuous current with a maximum DC resistance of 250mOhm. This component operates across the temperature range of -55°C to 125°C and is designed for through-hole axial mounting applications. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity.

Substiute Parts

70F157AP-RC

Bourns Inc.In Stock: 81970F157AP-RC Datasheet

Current PartRFQ

B78108E1151M000

EPCOS - TDK ElectronicsIn Stock: 4708B78108E1151M000 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 70F157AP-RC is determined by the following critical parameters:

• Inductance Value: The substitute must operate within the ±20% tolerance band of 9.4 nH (7.52 nH to 11.28 nH nominal range)
• Current Rating: The substitute must support the application's current requirements without saturation
• DC Resistance: Lower DCR values are acceptable; higher values may impact circuit performance
• Mounting Configuration: Through-hole axial mounting is required for mechanical compatibility
• Temperature Range: The substitute must maintain performance across -55°C to 125°C
• Regulatory Compliance: ROHS3 compliance is mandatory for equivalent substitution

The B78108E1151M000 from EPCOS - TDK Electronics is listed as a substitute part. However, this part exhibits significant parameter deviations from the 70F157AP-RC and does not meet the strict substitution criteria for this inductance value.

Parameter Comparison

Engineering Selection Recommendations

The B78108E1151M000 is listed as a substitute for the 70F157AP-RC; however, the inductance value deviation (150 nH versus 9.4 nH) represents a fundamental circuit parameter mismatch. This part should not be selected as a direct replacement without circuit redesign validation.

Selection of any substitute inductor must be based on:

• Exact inductance value matching within the specified tolerance band
• Current rating sufficient for the application without saturation
• Compliance with ROHS3 and applicable regulatory requirements
• Physical dimensions compatible with board layout constraints
• Operating temperature range encompassing the application environment

The 70F157AP-RC is obsolete. Procurement of equivalent parts requires identification of active inductors with matching inductance specifications (9.4 nH ±20%), current ratings, and form factors from active manufacturers.

Frequently Asked Questions (FAQ)

Q: Can the B78108E1151M000 be used as a direct replacement for the 70F157AP-RC?

A: No. The B78108E1151M000 has an inductance value of 150 nH, which is 16 times higher than the 70F157AP-RC's 9.4 nH specification. Direct substitution would alter circuit performance and is not recommended without complete circuit redesign and validation.

Q: What parameters must match for a valid substitute?

A: The inductance value must fall within the ±20% tolerance band (7.52 nH to 11.28 nH). The substitute must also maintain through-hole axial mounting, support the required current rating, and comply with ROHS3 standards.

Q: Are there physical dimension constraints for substitution?

A: Yes. The 70F157AP-RC uses a 0.140" diameter by 0.310" length axial package. Substitute parts must fit within the existing board layout and mounting holes. Dimensional variations may require PCB modification.

Q: What is the impact of lower DC resistance in a substitute part?

A: Lower DC resistance reduces power dissipation and heat generation in the inductor, which is generally beneficial. The 17mOhm DCR of the B78108E1151M000 is significantly lower than the 250mOhm maximum of the 70F157AP-RC, but this advantage is negated by the inductance mismatch.

Q: Is the 70F157AP-RC still available for procurement?

A: The 70F157AP-RC is classified as obsolete. Procurement should focus on identifying active equivalent inductors from current manufacturers with matching specifications rather than attempting to source remaining inventory of discontinued parts.